American Sign Language: "explain," "describe,"
or "instructions"

Both hands are in "F" handshapes. Use an alternating forward
and back motion. As you
slide one hand forward, slide the other backward. Repeat a couple times.
The hands do not go up and down, just forward and back.

EXPLAIN:

Sample sentence:
Can you explain algebra to me? = ALGEBRA CAN YOU EXPLAIN ME?

Notes:
If you move your hands ("F" handshapes) up and down alternately it means "judge/court/if."